Method of forming coils.



313733234. PATENTED JULY 7, 1903.

Jpw, LUNDSKOG.

METHOD OF FORMING cons.

APPLIOATION FILED JUNE 21, 1901.

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No. 733,234. PATENTED JULY 7, 1903. J. W. LUNDSKOG.

METHOD OF FORMING GOILS.

APPLIOATION FILED JUNE 21, 1901. 7

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forded. The arrangements shown have been can be applied directly to an armature or to found to be very desirable, since they impart rigidity to the coils.

\ In Fig. ()1 have illustrated a press which is employed in finishing the coils. The press consists of a base F, having a chamber G formed therein. The chamber is provided with an inlet II and an outlet I, through which steam can be passed for the purpose of heating the coil, and after the coil has been sufficiently heated the steam can be cut off and water admitted to reduce the temperature. 011 the upper surface of the base surfaces J are provided to receive and hold the coils in place. Sliding blocks K and L are employed for compressing the coil while it is hot. The block K is actuated by a pair of set-screws M, which are mounted in upwardly-extending ribs formed integral with the base. The block L is actuated by means of a pair of levers N, that are connected by the pin or red 0, which is arranged to cause simultaneous movement of the levers on the same side of the center bolt. Only one lever is shown in engagement with the block L on each side of the center bolt; but it is to be understood that there is a second lever placed directly behind the first, so as to press on the opposite end of the coil. The upper end of each lever is pivotally secured to a block P, which block is' mounted on the vertically-extending bolt Q. The block P is moved downward in a manner to force the sliding blocks L against the coil by means of a nut R and the levers N and is moved upward to release the blocks by the compression-spring S, situated between it and the base F. Both sides of the press are similar as to construction and operation, so further description is unnecessary.

After the coil has been wound and the strips of insulation B inserted in place the coil is placed in the press, the surfaces J being approximately equal in length to the sides of the coil. After the coil has been mounted in place the blocks K and L are put in position and the sct-screw M and the levers N advanced untilthe coil is securely held in place. After this steam is admitted to the base and the temperature increased until the insulating compound on the strips 13 softens or melts, after which additional pressure is applied to the blocks K and L. This causes the insulating compound to be forced into the fabric covering on the conductors and at the same time insures the external dimensions of the sides of the coil being correct. Steam is now out off from the chamber G and in place thereof water is admitted to reduce the temperature. The control is obtained by means of a suitable valve. (Not shown. After the temperature of the press has been reduced to a point where the insulating compound hardens the levers N and set-screws M are released, the blocks K and L detached, and the coil removed. The coil as it now stands any other picce of electrical apparatus for which it is intended. \Vhen the coil is removed from the press, it is very rigid and the side portions are firmly united, so that the coil may be freely handled even though it is composed of a plurality of separate coils which were originallynested or placed one within the other.

For certain kinds of work it is desirable to have additional insulation on the side portions of the coils, as is illustrated in Fig. 3. Surrounding the conductors is a wrapping T, of insulating materialsuch, for example, as oiled fabric.* in the present instance two layers are shown; but this may be varied to meet the conditions for which the coil is illtended The oiled fabric T is pr ferably secured to the conductors by a more or less complete coating of varnish or shellac. After the fabric'has been placed in the sides of the coilthe coil is given a covering of tape U. This taping is preferably spirally wound and extends over the ends, as well as the sides, of the coil.

lVhat I claim as new, and desire to secure by Letters Patent of the United States, is-

1. The method of forming a coil for electric apparatus, which consists in inserting between the convolutions of the coil pieces of insula tion which soften or melt at a certain increase in temperature, then subjecting the coil and insulation to the action of heat and while so 'he ated applying pressure, and finally reduc= ing the temperature.

2. The method of forming a coil for electric apparatusgvhich consists in inserting between the turns of the coil a body of insulating material which softens or melts at a definite in crease in temperature, then subjecting the coil and insulating material to the action of heat and while so heated applying pressure, and finally reducing the temperature while the pressure is maintained.

3. The method of forming a coil for electric apparatus, which consists in placing between the conductors a piece of material covered with an insulating compound which will soften or melt at a given increase of temperature, then subjecting the compound to the necessary increased temperature, and afterward reducing the temperature until the compound hardens.

4. The method of forming a coil for electric apparatus, which consists in placing between the insulated turns of the conductors a piece of material having a coating of insulating compound which softens or melt-s at a cor tain increase in temperature, and is suiiicient in amount to impregnate the insulation on certain portions of the wires when softened or melted, then subjecting the same to the necessary temperature to soften or melt ihe compound, and finallyreducingthe temperature until the compound hardens.

5. The method of forming a 0011 for electric to the coil, and finally reducing the temperaapparatus, which consists in placing piece titre of material covered Witha compound between In witness whereof I have hereunto set niy edjaeent convolutions, which compound is cahand this 18th day of June, 1901. 5 pable of softening or melting at a certain in- JULIUS EV. LUNDSKOG.

crease in temperature, then raising the tem- Witnesses: pel'eture of the compound to the necessary DUGALD MOK. MOKILLOP,

eint and whiie so heated applying pressure JOHN J. WALKER. 

